Report of the Meeting of the British Association for the Advancement of Science Volume 67

Report of the Meeting of the British Association for the Advancement of Science Volume 67

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...in the Terrestrial Magnetic Field. By Professor Frank H. Bigelow, U.S. Weather Bureau, Washington, B.C. This paper gives a brief outline of the computation leading to the type curve, the phenomenon of semi-annual inversion, and the explanation of the same. This conclusion is then used to criticise certain views of the origin of the diurnal and secular variations of the magnetic needle, widely held, and to advocate another working theory which seems to harmonise the system of magnetic observations in a suitable manner. 7. Observations at Toronto with Magnet Watch Integrator. By Professor Frank H. Bigelow. 8. The Yerkes Observatory. By George E. Hale, Director. The author gave an account of the buildings and instruments of the Yerkes Observatory, with a statement regarding the first observations made with the 40-inch telescope. 9. The Effects of Tension and Quality of tJie Metal upon the Changes in Length produced in Iron Wires by Magnetisation. By B. B. Brackett. 10. On the Susceptibility of Diamagnetic and Weakly Magnetic Substances. By A. P. Wills. In the paper the author describes in detail a new method, applicable in the experimental study of the magnetic properties of those substances in which the coefficient of magnetic susceptibility is very small, and either positive or negative. The method is based upon the property which all bodies have to a greater or less degree--namely, that they experience a mechanical force when placed in a non-homogeneous magnetic field. This force acta to impel the body towards stronger or weaker parts of the field, according as the body is magnetic or diamagnetic. By means of a large electromagnet a practically uniform field is obtained, at least sufficiently uniform to suit the purpose to which it is...show more

Product details

  • Paperback | 534 pages
  • 189 x 246 x 27mm | 943g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236801822
  • 9781236801821